@using System.Text.Json
@using LucideBlazor
@using Moonlight.Shared
@using Moonlight.Shared.Admin.Sys.ContainerHelper
@using ShadcnBlazor.Buttons
@using ShadcnBlazor.Dialogs
@using ShadcnBlazor.Progresses
@using ShadcnBlazor.Spinners

@inject HttpClient HttpClient

@inherits ShadcnBlazor.Extras.Dialogs.DialogBase

<DialogHeader>
    <DialogTitle>
        Updating instance to @Version...
    </DialogTitle>
</DialogHeader>

<div class="grid grid-cols-1 xl:grid-cols-2 w-full gap-5">
    <div class="text-base flex flex-col p-2 gap-y-1">
        @for (var i = 0; i < Steps.Length; i++)
        {
            if (CurrentStep == i)
            {
                <div class="flex flex-row items-center gap-x-1">
                    @if (IsFailed)
                    {
                        <CircleXIcon ClassName="text-red-500 size-5"/>
                    }
                    else
                    {
                        <Spinner ClassName="size-5"/>
                    }
                    <span>
                        @Steps[i]
                    </span>
                </div>
            }
            else
            {
                if (i < CurrentStep)
                {
                    <div class="flex flex-row items-center gap-x-1 text-muted-foreground">
                        <CircleCheckIcon ClassName="text-green-500 size-5"/>
                        <span>
                            @Steps[i]
                        </span>
                    </div>
                }
                else
                {
                    <div class="text-muted-foreground flex flex-row items-center gap-x-1">
                        <span class="size-5"></span>
                        @Steps[i]
                    </div>
                }
            }
        }
    </div>
    <div class="bg-black text-white rounded-lg font-mono h-96 flex flex-col-reverse overflow-auto p-3 scrollbar-thin">
        @for (var i = LogLines.Count - 1; i >= 0; i--)
        {
            <div>
                @LogLines[i]
            </div>
        }
    </div>
</div>

@if (CurrentStep == Steps.Length || IsFailed)
{
    <DialogFooter ClassName="justify-end">
        <Button Variant="ButtonVariant.Outline" @onclick="CloseAsync">Close</Button>
    </DialogFooter>
}
else
{
    <DialogFooter>
        <Progress ClassName="my-1" Value="@Progress"></Progress>
    </DialogFooter>
}

@code
{
    [Parameter] public string Version { get; set; }
    [Parameter] public bool NoBuildCache { get; set; }

    private bool IsFailed;
    private int Progress;
    private int CurrentStep;

    private readonly string[] Steps =
    [
        "Checking", // 0
        "Updating configuration files", // 1
        "Starting rebuild task", // 2
        "Building docker image", // 3
        "Redeploying container instance", // 4
        "Waiting for container instance to start up", // 5
        "Update complete" // 6
    ];

    private readonly List<string?> LogLines = new();

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender)
            return;

        // Checking
        CurrentStep = 0;
        Progress = 0;
        await InvokeAsync(StateHasChanged);

        await Task.Delay(2000);

        // Update configuration
        CurrentStep = 1;
        Progress = 20;
        await InvokeAsync(StateHasChanged);

        await HttpClient.PostAsJsonAsync("api/admin/ch/version", new SetVersionDto
        {
            Version = Version
        }, SerializationContext.Default.Options);

        // Starting rebuild task
        CurrentStep = 2;
        Progress = 30;
        await InvokeAsync(StateHasChanged);

        var request = new HttpRequestMessage(HttpMethod.Post, "api/admin/ch/rebuild");

        request.Content = JsonContent.Create(
            new RequestRebuildDto(NoBuildCache),
            null,
            SerializationContext.Default.Options
        );

        var response = await HttpClient.SendAsync(
            request,
            HttpCompletionOption.ResponseHeadersRead
        );

        await using var responseStream = await response.Content.ReadAsStreamAsync();
        using var streamReader = new StreamReader(responseStream);

        do
        {
            try
            {
                var line = await streamReader.ReadLineAsync();

                if (line == null)
                    break;

                if (string.IsNullOrWhiteSpace(line))
                    continue;

                var data = line.Trim("data: ");
                var deserializedData = JsonSerializer.Deserialize<RebuildEventDto>(data, SerializationContext.Default.Options);

                switch (deserializedData.Type)
                {
                    case RebuildEventType.Log:
                        LogLines.Add(deserializedData.Data);
                        break;

                    case RebuildEventType.Step:

                        switch (deserializedData.Data)
                        {
                            case "BuildImage":

                                // Building docker image

                                CurrentStep = 3;
                                Progress = 40;

                                await InvokeAsync(StateHasChanged);
                                break;

                            case "ServiceDown":

                                // Redeploying container instance

                                CurrentStep = 4;
                                Progress = 60;

                                await InvokeAsync(StateHasChanged);
                                break;
                        }

                        break;

                    case RebuildEventType.Failed:

                        IsFailed = true;
                        await InvokeAsync(StateHasChanged);

                        return;
                }

                await InvokeAsync(StateHasChanged);
            }
            catch (Exception)
            {
                break;
            }
        } while (true);

        // Waiting for container instance to start up

        CurrentStep = 5;
        Progress = 90;
        await InvokeAsync(StateHasChanged);

        // Wait some time for instance to shut down
        await Task.Delay(TimeSpan.FromSeconds(5));

        // Ping instance until its reachable again
        while (true)
        {
            try
            {
                await HttpClient.GetStringAsync("api/ping");
                break;
            }
            catch (Exception)
            {
                // Ignored
            }

            await Task.Delay(3000);
        }

        // Update complete
        CurrentStep = 7;
        Progress = 100;
        await InvokeAsync(StateHasChanged);
    }
}